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Standardize data columns in R
...taset called spam which contains 58 columns and approximately 3500 rows of data related to spam messages.
15 Answers
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What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
Ive got a bunch of rectangular objects which I need to pack into the smallest space possible (the dimensions of this space should be powers of two).
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Is there a way to crack the password on an Excel VBA Project?
... been asked to update some Excel 2003 macros, but the VBA projects are password protected, and it seems there's a lack of documentation... no-one knows the passwords.
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Does Java have a HashMap with reverse lookup?
I have data that is organized in kind of a "key-key" format, rather than "key-value". It's like a HashMap, but I will need O(1) lookup in both directions. Is there a name for this type of data structure, and is anything like this included in Java's standard libraries? (or maybe Apache Commons?)
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How to get the instance id from within an ec2 instance?
How can I find out the instance id of an ec2 instance from within the ec2 instance?
32 Answers
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Entity Framework Code First - two Foreign Keys from same table
I've just started using EF code first, so I'm a total beginner in this topic.
6 Answers
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What is the correct way to create a single-instance WPF application?
Using C# and WPF under .NET (rather than Windows Forms or console), what is the correct way to create an application that can only be run as a single instance?
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How to count the number of set bits in a 32-bit integer?
...(like x86's popcnt, on CPUs where it's supported) will almost certainly be fastest. Some other architectures may have a slow instruction implemented with a microcoded loop that tests a bit per cycle (citation needed).
A pre-populated table lookup method can be very fast if your CPU has a large cach...
Redirecting Output from within Batch file
I am creating a batch file with some simple commands to gather information from a system. The batch file contains commands to get the time, IP information, users, etc.
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